#include <REGX52.H>
#include "Delay.h"

/*




*/
unsigned char MatrixKey(){
	unsigned char KeyNumber=0;
	P1=0xff;
	P1_3=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber =1;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber =5;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber =9;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber =13;}
	
	P1=0xff;
	P1_2=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber =2;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber =6;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber =10;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber =14;}
	
	P1=0xff;
	P1_1=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber =3;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber =7;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber =11;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber =15;}
	
	P1=0xff;
	P1_0=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber =4;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber =8;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber =12;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber =16;}

	return KeyNumber;

}
